Keywords: 
• Hujianshan area /
• sedimentary facies /
• distribution regularity /
• internal reservoir structure /
• dominant control factors

Abstract: Based on the fundamental data of core, log and well logging，we studied the sedimentary microfacies types and evolutionary feature of Chang 6 in Hujianshan area and analyzed the distribution regular pattern of the oil and water and geologic condition which controlled the distribution of oil and water layers. The result showed there were four sandmicrofacies in Hujianshan area，including the subaqueous distributary channel, channelmouth bar, distal bar and interdistributary. The schedule of exploration indicates that oil reservoir can be found in different sedimentary microfacies and water layer almost seize thicklystratified sand. Oilbearing capability of different parts of sedarenite deposited at the same time is not exactly the same. The complex character about distribution regularity of oil and water shows that sedimentary facies are not the unique factor which controls the complicate distribution of oil and water. Internal reservoir structure ,calcarinate degree，the capability of oil lateral migration and the connectivity of sedarenite in different periods all had an effect on distribution regularity of oil and water, but the important reasons were the sand distribution feature，the capability of oil lateral migration and internal reservoir structure.